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Officially the Servicemen's Readjustment Act of 1944, the G.I. Bill was created to help veterans of World War II. It established hospitals, made low-interest mortgages available and granted stipends covering tuition and expenses for veterans attending college or trade schools.
Geologic maps are most recognized by their colors/symbols which represent different rock units/rock ages. If you observe a geological map, you would notice different areas have different colors. These colors usually denote similar characteristics in rocks surrounding an area (age, type). Symbols are denoted by a capital letter followed by lower case letters. The capital letter represents the age of the unit.